🚀 go-pugleaf

I'm looking for information about the hardware and/or firmware
configuration of the lisa.  I have the uncompleted, and poor, hardware
manual that was given out by apple to all who asked for it, but there's
some vital information missing.

I have a binary license of Unisoft's implementation of Unix system V
running on my lisa, and want to add parallel printer support.  The
way I'm trying to get there is to disassemble the existing corvus disk-
drive driver, and use the information gleaned from that to write my
simple printer driver.  Then, I'll use /dev/mem to overwrite the corvus
driver before I print.

I was doing fine, until I ran into an access (... many accesses) to
0xFA0000.  This is apparently the base address of a bank of hardware
control registers, but it's not mentioned anywhere in the aforementioned
manual that I have.

Any help, knowledge, or suggestions will be greatly appreciated... I
wonder if there are any lisa/system V users out there who'd like to
form a users group?

Thomas Mellman
...ihnp4!ttrdc!ttrdd!mellman